﻿/// Copyright (c) 2012 John Tear
///
/// Permission is hereby granted, free of charge, to any person obtaining a copy of this software 
/// and associated documentation files (the "Software"), to deal in the Software without restriction, 
/// including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, 
/// and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, 
/// subject to the following conditions:
///
/// The above copyright notice and this permission notice shall be included in all copies or substantial 
/// portions of the Software.
///
/// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT 
/// LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN 
/// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 
/// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE 
/// SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
///

using System;
using System.Collections.Generic;
using System.Text;

using com.feelgoodsoftware.sharptftp.utilities;

namespace com.feelgoodsoftware.sharptftp
{
    public class TftpErrorPacket : TftpBasePacket
    {
        /// <summary>
        /// The error code.
        /// </summary>
        public TftpErrorCode ErrorCode { get; set; }

        /// <summary>
        /// The error message.
        /// </summary>
        public string ErrorMessage { get; set; }

        /// <summary>
        /// Constructor.
        /// </summary>
        /// <param name="Bytes">The bytes received on the network wire.</param>
        public TftpErrorPacket(byte[] Bytes)
        {
            try
            {
                OpCode = (TftpOpCode)Bytes[1];
                ErrorCode = (TftpErrorCode)BitConverter.ToInt16(Bytes, 2);
                ErrorMessage = Encoding.ASCII.GetString(Bytes, 4, Bytes.Length - 5);
            }
            catch (Exception ex)
            {
                // todo: throw a tftp eception, packet is not formated correctly
                throw new NotImplementedException(ex.Message);
            }
        }

        public TftpErrorPacket(TftpErrorCode ErrorCode, string ErrorMessage)
        {
            OpCode = TftpOpCode.ERROR;
            this.ErrorCode = ErrorCode;
            this.ErrorMessage = ErrorMessage;
        }

        public override byte[] ToByteArray()
        {
            byte[] returnArray = new byte[2] { 0, (byte)OpCode };
            returnArray = ByteArray.Combine(returnArray, BitConverter.GetBytes((short)ErrorCode));
            returnArray = ByteArray.Combine(returnArray, Encoding.ASCII.GetBytes(ErrorMessage));
            returnArray = ByteArray.Combine(returnArray, new byte[1] { 0 });

            return returnArray;
        }
    }
}